Jack for removing pipes or casings from earth-borings.



A. G. LUDLUM.

JACK FOR REMOVING PIPES on OASINGS FROM EARTH sonmes.

APPLICATION FILED JUNE 8, 1911.

Patented Aug. 27, 1912.

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ATES PATENT OFFTC 92 ALBERT C. LTJ'DLUM, OF NEW YORK, N. Y., ASSIGNOR TO NEW YORK ENGINEERING COMPANY, A CORPORATION OF NEW YORK.

JACK FOR REMOVING PIPES 0R CASINGS FROM EABTI-I-IBORINGS.

Specification of Letters Patent.

Application filed June 8, 1911.

To all whom it may concern:

Be it known that I, ALBERT C. LUDLUM, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Jacks for Removing Pipes or Casings from Earth- Borings, of which. the following is a full, clear, and exact specification.

This invention relates to improvements for lifting pipes or casings out of borings in the earth, which borings may be for the purpose of obtaining samples of earth from beneath the surface, for providing wells or for other purposes. For instance, it is often desired to obtain gold bearing sands which are beneath the surface, and to do this a pipe may be sunk until the sand is reached and the sand abstracted through the pipe. When the pipe has been in position for a considerable length of time it becomes corroded and fixed in the bore with firmness. A large force is therefore required to loosen and withdraw the pipe or casing when it is desired to remove the same.

It is the main object of the present invention to provide means for effectively and conveniently supplying the necessary force to withdraw the pipe or casing. The pipe or casing is usually made up of sections screwed together.

cult, if not impossible, to recover the lower sections.

It is a further object of the invention to provide means of the character described, in'

Should these sections be-I come separated it would be extremely diifi- Patented Aug. 27, 1912.

Serial No. 632,053.

provided with a seat 2, in which a nut 3 may rotate. The nut is, however, normally held against rotation by latches 4 pivoted on the standard-and engaging in notches 5 in the nutand having noses 6 overlapping the edges of the nut. Springs 7, when they bear against the plain surface 8, tend to hold the latches in position to secure the nut as shown in the drawing, but turning a latch outwardly until the spring comes into engagement with the circular portion 9 of the latch, will remove such tendency of the spring, and the latch will then remain out of operative relation to the nut until it is again turned inwardly to such extent that the spring again presses it into holding relation to the nut. Within the nut 3 is a sleeve 10 having an exterior screw thread which engages with a corresponding thread in the nut, and of course moves up or down according to the direction in which it is turned with relation to the nut. Secured to the upper end of the sleeve 10 is a grip ring 11 having an off-set eccentric portion 12, in which is located a gripping piece 13, which has vertically extending threads or teeth 14 and a projection 15 which extends through a slot 16 in the grip ring, this arrangement of slot and projection preventing longitudinal while permitting circumferential movement of the gripping piece with relation to the grip ring. Upon the inner face of the grip ring are provided circumferential threads or teeth 17. To turn the grip ring, it is provided with a lug 18. It will now be apparent that if the grip ring is placed about a pipe and turned in the direc tion as indicated by the arrows in Figs. 2 and 3, the gripping piece 13 will be forced toward the narrow end of the eccentric offset and will become tightly wedged between the pipe and the grip ring, thus securely gripping the ring to the pipe, and the greater the turning force applied the tighter will the pipe be gripped by the ring. To turn the grip ring, and with it the pipe and the threaded sleeve, a collar 19 may be placed upon the pipe, and to this collar is pivoted a'lever 20, which is connected with the lug 18 of the grip ring by means of a chain 21 lefthanded in the drawing.

thread usually being righthanded. In order that the turning of the pipe or'casing in removing the same may not operate to unscrew the sections and so leave the lower ones in the earth, from which it would be practically impossible to abstract them, the screw thread by which the sleeve 10 and the nut 3 engage is made of the opposite character fromthose securing the pipe sections together. For example, if the screw threads for securing the sections of the pipe together are righthanded, the threads between the sleeve and nut should be lefthanded. As beforest-ated, the screw threads for securing pipe sections together are usually righthanded, and therefore the screw threads between the nut and sleeve are shown as If, however, under any particular circumstances lefthanded threads should be employed between the pipe sections, a righthanded lifting thread in the jack should be employed.

With the apparatus as shown in the drawing, the pipe creasing being within the boring, a horse or other suitable means of power may be attached to the outer end of the lever 20 and the same turned in the direction of the arrow as shown in Fig. 2. This will operate to firmly grip the pipe to the sleeve 10 as before described, and turn the pipe and sleeve together. This twisting movement of the pipe is of advantage in twistarv nut.

ing the pipe loose from its containing walls. This turning also serves to lift the sleeve andpipe by reason of the screw-threaded engagement of the sleeve with the stationo As the turning continues, the lower end of the sleeve will eventually reach the nut when further turning, without readjustment, would result in screwing the sleeve out of the top of the nut. When the end of the sleeve has reached the nut, the sleeve may be released from the pipe by loosening the grip ring which may be accomplished by blows delivered upon the lug 18 to drive it in the opposite direction from that indicated by the arrow in Fig. 3,

or by blows applied to the projection 15 tending to drive the gripping piece 14 to the wide end of the eccentric off-set. The sleeve having been loosened from the pipe, the latches 43may be pulled outwardly and the nut released. Thereupon, the nut can be turned in its seat in such direction as to move the sleeve downwardly with relation to the pipe. When this has been carried on to a suflicient degree, the nut may be again secured, the pipe gripped to the sleeve, and the lifting of the pipe carried on as before.

While the invention has been illustrated in what is considered its best application, it is realized that variousmodifications of the structure'shown in the drawing may be made without departing from the spirit of the invention, which is not therefore limited to the specific structure used for illustration.

Having thus described my invention, I declare that what I claim as new and desire to secure by Letters Patent is 1. In apparatus of the character described, the combination with a support, of two members having screw-threaded engagement with each other, one of said members being secured to said support, means adapted to grip the pipe to be withdrawn to the other of said members to turn therewith when turned in one direction and to release the same when turned in the oppositedirection and means for turning the pipe and the member gripped to it.

2. In apparatus of the character described, the combination with a standard, of a sleeve screw-threaded therein and adapted to move upwardly to raise the pipe when turned in one direction, and means adapted to grip the pipe to said sleeve to turn therewith when turned in the direction for raising the pipe and to release the same when turned in the opposite direction, the direction of turning to grip the pipe and raise it being that adapted to screw the pipe sections together, and means for turning the said sleeve in said standard.

3. In apparatus of the character described, the combination with a standard, of a sleeve screw-threaded therein and adapted to move upwardly to raise the pipe when turned in one direction, means adapted to grip the pipe to said sleeve to turn therewith when turned in the direction for raising the pipe and to release the same when turned in the opposite direction, and means for turning the said sleeve in said standard.

' 4:. In apparatus of the character-described, the combination with a standard, of a sleeve screw-threaded therein, means for gripping the pipe to the sleeve to turn therewith, a lever for turning said sleeve, a collar about the pipe to which said lever is secured, and a connection between said lever and said sleeve.

5. In apparatus of the character described,

the combination with a standard, of a nut adapted to be raised by turning in one direction, means adapted to grip the pipe to In testimony whereof I afiix my signature said sleave to turn therewith when turlned in presence of two witnesses.

in the irection to raise said sleeve an to release the same when turned in the other ALBERT LUDLUM' direction, a lever for turning said sleeve Witnesses: and a flexible connection between said sleeve J. S. Woosrmn, and said lever. GEO. N. KERR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

